Help with win32 app in windows using C++

I'm still learning Win32 apps in C++, and I can't seem to find any information on how to check if a radio button or checkbox button is checked. I can find it for using MCF apps, but I'd like to stay away from that for now.
Anyway, I created a dialog box with a few radio buttons and a couple "normal" buttons, and when the user clicks on one of the "normal" buttons, the program should check which radio button is checked and do something different.
Example:

Code (Text):

1. // other code... in dialog message loop
2. switch (LOWORD(wParam)) {
3.  
4.     case IDC_NORMAL_BUTTON:
5.       {
6.             if ( /* check if radio button is checked */ )   //  unsure how to do this... in win32
7.                        Function1();
8.              else
9.                        Function2();
10. // other code...

Any advice or help would be great!!
Thanks.

 

Awsome! Thanks a lot!